http://www.seed-forum.com/viewtopic.php?t=25370Quick Summary for Everyone (I don't know Japanese, so this is gonna be rough):
SPOILERS
Phantom Pain, consisting of the Strike Noir, Verde Buster, and a bunch of Slaughter Daggers attacks DSSD. Basically the only opposition they had was the DSSD Astrays.
Eventually, Selene and Sol launch in the Stargazer, which proceeds to tear through the Phantom Pain forces because they can basically dodge anything by making the ring spin really fast which sends them shooting off in various directions.
Sven starts to fight Stargazer, and eventually, Stargazer activates a weapon that surrounds it with rings, similiar to the model of an atom, but the rings are like beam sabers. The ring cuts off one of Strike Noir's arms and through part of its torso before it runs out of power.
Selene ejects Sol from the Stargazer and grabs onto Strike Noir and instructs DSSD to fire an laser at them. DSSD shoots the Strike Noir and Stargazer and then proceeds to turn the laser and shoot Phantom Pain's ship, destroying it.
It is revealed that the Stargazer and Strike Noir survived the blast, although they are presumably pretty far away from DSSD. Selene opens the Noir's cockpit and finds Sven passed out.
Sven wakes in Stargazer cockpit and Selene him by injecting some medicine and such, and they let go of the Noir and start flying off to some destination in the Stargazer.
There's a huge flashback of Sven's life, and the Stage ends with Sven and Selene in a sleeping in a sleeping bag together in Stargazer's cockpit. After the credits roll, it shows the two of them sleeping while Sol's voice on the radio asks for Selene and the Stargazer to respond.